16 
THE TANNINS. 
gave it extensive publicity, while the more scientific 
works of Diz6 and Deyeux were overlooked. 
In 1802, Proust wrote another memoir on tannin, in 
which he concluded that there were many different 
kinds of tannin in different plants. This appears to be 
the first statement of what lias since proved to be a most 
important principle in the study of the tannins, and 
with this work of Proust the history of the discovery 
of tannin may well be closed, and further historical 
considerations taken up under the individual members 
of the class. 
